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Composite material having improved electrical conductivity and molded part containing same

Inactive Publication Date: 2016-07-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a composite with improved conductivity that can be used in various parts where high conductivity is required. The composite is produced by extrusion of a thermoplastic resin composition including carbon nanotubes, which are raw materials with low reactivity during extrusion. This results in a composite with less reduced average length of carbon nanotubes, leading to improved conductivity while maintaining the mechanical strength of the thermoplastic resin.

Problems solved by technology

However, these additives tend to deteriorate the physical properties (such as conductivity and mechanical strength) of final molded articles.
However, the addition of a large amount of carbon black is necessary to achieve high electrical conductivity and the structure of carbon black also tends to decompose during melt mixing.
The resulting resins suffer from poor processability and considerable deterioration in thermal stability and other physical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0062]Components and additives used in the following examples and comparative examples are as follows.

[0063](a) Polyamide Resin

[0064]LUMID GP-1000B (LG Chem Ltd.)

[0065](b) Carbon Nanotubes

[0066]Carbon nanotubes having the specifications shown in Table 1 were purchased or synthesized in laboratory.

experimental examples

[0070]The physical properties of the specimens produced in Examples 1-5 and Comparative Examples 1-3 were measured by the following methods. The results are shown in Table 2.

[0071]Tensile Strength and Tensile Modulus

[0072]The 3.2 mm thick specimens were evaluated for tensile strength and tensile modulus in accordance with the ASTM D638 testing standard.

[0073]Surface Resistivity (Ω / cm)

[0074]The surface resistance values of the specimens were measured using SRM-100 (PINION) in accordance with ASTM D257.

[0075]Bundle Average Length

[0076]The pellets produced in Examples 1-4 and Comparative Examples 1-3 were dispersed in chloroform to obtain 0.1 g / l dispersions. Images of the dispersions were taken by TEM (Libra 120, Carl Zeiss Gmbh, Germany) and analyzed using SCANDIUM 5.1 (Olympus Soft Imaging Solutions GmbH) to determine the buddle average lengths of the carbon nanotubes.

TABLE 2PhysicalExample No.Comparative Example No.properties1234123Tensile strength82838688758279(MPa)Tensile modulus...

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Abstract

Provided is a composite produced by processing a resin composition including a thermoplastic resin and carbon nanotubes. The carbon nanotubes have an ID / IG of 0.01 to 1.0 and the rate of residual length of the carbon nanotubes present in the composite is from 1% to 50%. The composite has the advantage of high conductivity. Due to this advantage, the composite can be used to manufacture various molded articles where conductivity is required.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a composite with improved conductivity and a molded article including the composite.[0003]2. Description of the Related Art[0004]Thermoplastic resins, particularly high performance plastics with excellent mechanical properties and good heat resistance, are used in various applications. For example, polyamide resins and polyester resins are suitable for use in the manufacture of a variety of industrial parts, including electrical / electronic parts, machine parts and automotive parts, mainly by injection molding due to their good balance of mechanical properties and toughness. Polyester resins, particularly polybutylene terephthalate and polyethylene terephthalate, with excellent in moldability, heat resistance, mechanical properties, and chemical resistance are widely used as materials for industrial molded articles such as connectors, relays, and switches of automobiles and electrical / ele...

Claims

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Application Information

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IPC IPC(8): H01B1/24
CPCH01B1/24C08K7/24C08K2201/011C08L77/06C08L101/12C08K3/041C08K7/00C08J5/00B29C48/022B29C45/0001C08K2201/004C08K2201/003
Inventor CHOI, YEON SIKLEE, SU MINCHOI, GI DAEYUN, CHANGHUN
Owner LG CHEM LTD
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